CN207104267U - A kind of connecting rod shop bolt being oriented to based on wedge slide block is pressed special fixture - Google Patents

Abstract

It the utility model is related to engine truncation connecting rod mounting technology field, especially a kind of connecting rod shop bolt being oriented to based on wedge slide block is pressed special fixture, including clamp body, the bottom of the clamp body is provided with pre-tightening mechanism, it is horizontal on the clamp body to be provided with cylinder, the end of the cylinder is connected with the inclined tapered wedges in upper surface, the clamp body, which is provided with, clamps guide bracket, sliding block is vertically slidably fitted with the clamping guide bracket, the slider bottom and tapered wedges upper contact, the top of the sliding block is installed with floating holding jaw, compared with prior art, the utility model is clamped using wedge, with simple in construction, force increasing ratio is big, the features such as self-locking property is good.And cylinder driving wedge block is used, its is easy to operate, and operating efficiency is high.

Description

A special fixture for press-fitting connecting rod positioning pin based on the guide of the inclined wedge slider

technical field

The utility model relates to the technical field of engine flat-cut connecting rod assembly, in particular to a special fixture for press-fitting connecting rod positioning pins guided by a wedge slider.

Background technique

The connecting rod is an important transmission part in the engine. Its main function is to convert the reciprocating linear motion of the piston into the rotational motion of the crankshaft and output torque outward. Connecting rods can be divided into flat-cut connecting rods and expansion-broken connecting rods according to the processing and connection methods of the big head holes. A typical body-cover assembly method of flat-cut connecting rods is pin positioning and bolt tightening. When the connecting rod is installed in the engine, the body cover needs to be disassembled and embedded in the bearing bush to be installed on the crankshaft. Usually, the pin holes are processed on the connecting rod body and the cover body, one end is clearance fit with the pin, and the other end is interference fit with the pin, and one end of the interference fit needs to use a press to press the positioning pin into the connecting rod positioning pin hole that is interference fit with the pin In the press-fitting process, the fixture needs to have sufficient clamping force to ensure that the positioning position of the connecting rod is accurately fixed. In the prior art, the piston-type hydraulic clamping rod is used, and the clamping pressure is greater than 1.5 times the maximum pressing force. This method uses the pressure generated by the punch of the press to achieve positioning and clamping. Although the clamping is reliable, its working efficiency low, and the clamping lever is vulnerable.

Utility model content

The purpose of this utility model is to solve the shortcomings of low efficiency and easy damage in the prior art, and propose a special clamp for pressing the positioning pin of the connecting rod based on the wedge slider guide.

In order to achieve the above object, the utility model adopts the following technical solutions:

Design a special fixture for press-fitting connecting rod positioning pins based on the guidance of the wedge slider, including a clamp body, the bottom of the clamp body is provided with a pre-tightening mechanism, and the clamp body is horizontally equipped with a cylinder, and the end of the cylinder The upper surface of the inclined wedge is connected to the upper surface, and the clamping body is provided with a clamping guide seat, and a slider is slid on the clamping guide seat along the vertical direction. The bottom of the slider and the upper part of the oblique wedge contact, the upper part of the slider is fixedly equipped with floating jaws, the upper part of the clamp body is horizontally provided with a connecting rod separation surface positioning plate, and both sides of the connecting rod separation surface positioning plate are provided with bolt holes for positioning pin and pin guide hole, the top of the clamp body is vertically provided with a lifting mechanism, the lifting mechanism is provided with a depressing block, and both sides of the bottom of the depressing block are provided with depressing punches.

Preferably, the pre-tightening mechanism includes a small head support arranged at the bottom of the clamp body, a guide groove is provided in the small head support along the vertical direction, and a small head movable pin is slidably installed in the guide groove. A spring is connected between the bottom of the movable pin of the head and the bottom of the support of the small head, and a washer is arranged on the upper end of the movable pin of the small head.

Preferably, a cylinder support plate is installed on one side of the clamp body, and the cylinder is fixed on the cylinder support plate.

Preferably, a wedge connection block is connected between the cylinder and the wedge block.

Preferably, a wear-resistant bush is embedded inside the pin guide hole.

Preferably, a punch fixing ring is connected between the press pin block and the ejector pin seat.

Preferably, the lifting mechanism includes a ejector seat, the press pin block is fixed on the bottom of the ejector seat, guide posts are vertically provided on both sides of the upper part of the clamp body, and a pressure pin is vertically provided above the ejector seat. A press punch, the top of the push rod seat is vertically connected with a push rod, and the lower end of the press punch is fixed on the top of the push rod.

Preferably, the guide post includes a long post and a short post which are socketed, the lower end of the long post is connected to the upper part of the clamp body, the upper end of the short post is fixed on the ejector seat, and the long post and the short post are connected Set limit gasket.

The utility model proposes a special fixture for pressing the positioning pin of the connecting rod based on the guide of the inclined wedge slider. , good self-locking performance and so on. And the wedge is driven by the cylinder, which is easy to operate and has high working efficiency.

Description of drawings

Fig. 1 is a front view of a special fixture for press-fitting connecting rod positioning pins based on the wedge slider guidance proposed by the utility model;

Fig. 2 is a side view of a special clamp for pressing the positioning pin of the connecting rod based on the guidance of the wedge slider proposed by the utility model.

In the figure: inclined wedge block 1, inclined wedge connecting block 2, clamping guide seat 3, slider 4, floating jaw 5, bolt hole positioning pin 6, pin guide hole 7, connecting rod separation surface positioning plate 8, guide Column 9, press punch 10, pressure pin block 11, pressure pin punch 12, punch fixed ring 13, ejector rod seat 14, ejector rod 15, small head support 16, small head movable pin 17, washer 18, Clamp body 19, cylinder support plate 20, spacer washer 21, cylinder 22.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example.

Referring to Fig. 1-2, a special fixture for press-fitting connecting rod positioning pins based on the guidance of the wedge slider, including a clamp body 19, the bottom of the clamp body 19 is provided with a pre-tightening mechanism, and the pre-tightening mechanism includes a The small head support 16 of the small head support 16 is provided with a guide groove along the vertical direction, and the small head movable pin 17 is slidably installed in the guide groove, and the bottom of the small head movable pin 17 is connected with the small head support 16 bottoms. Spring is arranged, and the upper end of small head movable pin 17 is provided with washer 18. The clamp body 19 is connected and fixed with the T-groove of the press workbench by bolts, and the small head movable pin 17 and the washer 18 are pushed by the inner spring of the small head support 16 to realize the pre-clamping of the workpiece.

A cylinder 22 is horizontally arranged on the clamp body 19 , and a cylinder support plate 20 is installed on one side of the clamp body 19 , and the cylinder 22 is fixed on the cylinder support plate 20 . The end of the cylinder 22 is connected with a wedge block 1 with an inclined upper surface, and a wedge connecting block 2 is connected between the cylinder 22 and the wedge block 1 . Clamping body 19 is provided with clamping guide seat 3, and slide block 4 is installed on the clamping guide seat 3 along the vertical direction slidingly, and the bottom of slide block 4 is in contact with the upper part of wedge block 1, and the upper part of slide block 4 is fixedly installed with floating Clamping claw 5, the upper part of clamping body 19 is horizontally provided with connecting rod splitting surface positioning plate 8, both sides of connecting rod splitting surface positioning plate 8 are provided with bolt hole positioning pin 6 and pin guide hole 7, pin guide hole 7 The interior is inlaid with wear-resistant bushings. The horizontal movement of the cylinder 22 is converted into the up and down movement of the slider 4 and drives the floating jaw 5 to move, and the reverse self-locking property of the wedge block 1 is used to reliably fix the position of the floating jaw 5.

The top of the clamp body 19 is vertically provided with a lifting mechanism, and the lifting mechanism is provided with a pressure pin block 11. A guide post 9 is directly provided, and the guide post 9 includes a long post and a short post that are socketed. The lower end of the long post is connected to the upper part of the clamp body 19, and the upper end of the short post is fixed on the ejector seat 14. The connection between the long post and the short post The set has spacers 21. The guide post 9 plays a guiding role.

A press punch 10 is vertically arranged above the push rod seat 14 , and the top of the push rod seat 14 is vertically connected with a push rod 15 , and the lower end of the press punch 10 is fixed on the top of the push rod 15 . Both sides of the bottom of the depressing block 11 are provided with depressing punches 12 . A punch fixing ring 13 is connected between the pressing pin block 11 and the ejector pin seat 14 . The press punch 10 drives the push rod seat 14 to move up and down along the guide post 9 through the push rod 15, and the pressure of the press is transmitted as the pressing force of the pin pressing punch 12 to the pin, so as to realize the pin pressing.

Working principle: Place the connecting rod on the fixture, the small end of the connecting rod presses down the movable pin 17 of the small end, and the pin is pushed by the inner spring of the small end support 16 to make the jointing surface of the connecting rod fit with the positioning plate 8 of the jointing surface , while the bolt hole positioning pin 6 fixes the bolt holes on the split surface to realize the positioning of the connecting rod. After the positioning pin is installed, the cylinder 22 drives the slider 4 to move upward by pushing the wedge block 1, so that the floating claw 5 clamps the workpiece; then the press punch 10 moves downward to push the ejector rod 15 and the ejector rod seat 14 to Next, the pressing pin block 11 fixed on the ejector rod seat 14 drives the pressing pin punch 12 to press the connecting rod positioning pin into the positioning pin hole of the connecting rod body.

The above is only a preferred embodiment of the utility model, but the scope of protection of the utility model is not limited thereto. The equivalent replacement or change of the new technical solution and the concept of the utility model shall be covered by the protection scope of the utility model.

Claims (8)

1. A special fixture for press-fitting connecting rod positioning pins based on the guidance of the wedge slider, comprising a clamp body (19), characterized in that: the bottom of the clamp body (19) is provided with a pre-tightening mechanism, and the clamp body (19) is horizontally provided with a cylinder (22), the end of the cylinder (22) is connected with an oblique wedge (1) with an inclined upper surface, and the clamping body (19) is provided with a clamping guide seat (3 ), the clamping guide seat (3) is slidably installed with a slide block (4) along the vertical direction, the bottom of the slide block (4) is in contact with the upper part of the wedge block (1), and the slide block (4) A floating jaw (5) is fixedly installed on the upper part of the clamp body (19), and the upper part of the clamp body (19) is horizontally provided with a connecting rod splitting surface positioning plate (8), and the two sides of the connecting rod splitting surface positioning plate (8) Bolt hole positioning pins (6) and pin guide holes (7) are all provided, and the upper part of the clamp body (19) is vertically provided with a lifting mechanism, and the lifting mechanism is provided with a pin pressing block (11). Both sides of the bottom of the depressing block (11) are provided with depressing punches (12). 2. A special fixture for press-fitting connecting rod positioning pins based on the wedge slider guidance according to claim 1, characterized in that: the pre-tightening mechanism includes a small head support arranged at the bottom of the clamp body (19) (16), the inside of the small head support (16) is provided with a guide groove along the vertical direction, and the small head movable pin (17) is slidably installed in the guide groove, and the bottom of the small head movable pin (17) is connected with the small head A spring is connected between the bottoms of the supports (16), and a washer (18) is provided on the upper end of the small head movable pin (17). 3. A special jig for press-fitting connecting rod positioning pins based on wedge slider guidance according to claim 1, characterized in that: a cylinder support plate (20) is installed on one side of the jig body (19), The cylinder (22) is fixed on the cylinder support plate (20). 4. A special fixture for press-fitting connecting rod positioning pins based on the wedge slider guide according to claim 1, characterized in that: a wedge is connected between the cylinder (22) and the wedge block (1) Connect the blocks (2). 5. A special fixture for press-fitting connecting rod positioning pins based on wedge slider guidance according to claim 1, characterized in that: said pin guide holes (7) are embedded with wear-resistant bushings. 6. A special clamp for pressing the positioning pin of the connecting rod based on the guidance of the wedge slider according to claim 1, characterized in that: there is a Punch retaining ring (13). 7. A special fixture for press-fitting connecting rod positioning pins based on the wedge slider guidance according to claim 1, characterized in that: the lifting mechanism includes a push rod seat (14), and the pin pressing block (11 ) is fixed on the bottom of the mandrel seat (14), and guide posts (9) are vertically arranged on both sides of the upper part of the clamp body (19), and a press punch (9) is vertically provided above the mandrel seat (14). 10), the top of the ejector rod seat (14) is vertically connected with a ejector rod (15), and the lower end of the press punch (10) is fixed on the upper end of the ejector rod (15). 8. A special fixture for press-fitting connecting rod positioning pins based on the wedge slider guidance according to claim 7, characterized in that: the guide column (9) includes a long column and a short column that are socketed, and the The lower end of the long column is connected to the upper part of the clamp body (19), the upper end of the short column is fixed on the ejector rod seat (14), and the joint between the long column and the short column is fitted with a spacer (21).